4.6 Article

High-performance Ti-doped ZnS thin film anode for lithium-ion batteries

Journal

NANOTECHNOLOGY
Volume 33, Issue 45, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.1088/1361-6528/ac84e1

Keywords

Ti-doped ZnS; thin film; RF magnetron sputtering; lithium ion battery

Funding

  1. National Key R&D Program of China [2020YFB2007400]
  2. National Natural Science Foundation of China [21 935 009]

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Thin film microbattery is necessary for providing stable on-chip power for microdevices or microsystems. This study focuses on the development of Ti-doped ZnS thin film as a new type of anode with improved electrochemical performance in lithium ion battery, showing good cycling stability and higher specific capacity.
Thin film microbattery is urgently needed to provide a long-term stable on-chip power for various kinds of microdevices or microsystems. Anode is a core component in thin film lithium ion microbattery, however, previous researches mostly focused on metal oxide or Si-based thin film anodes, and the reports of metal sulfide thin film anodes are limited. Herein, we present a new type of Ti-doped ZnS thin film fabricated by radio frequency (RF) magnetron co-sputtering. The Ti doping is designed to enhance the overall electrical conductivity of the ZnS thin film, since the insulation of ZnS is one of the major barriers to deliver its lithium storage performance. As an anode applied in lithium ion battery, the Ti-doped ZnS thin film exhibits good cycling stability up to 500 cycles at a current density of 1.0 A center dot g(-1), and remains a higher specific capacity of 463.1 mAh center dot g(-1) than that of the pure ZnS thin film, showing its better electrochemical reaction reversibility. The rate capability and EIS measurements manifest the more favorable electrochemical reaction kinetics of the Ti-doped ZnS thin film, moreover, the CV tests at various scan rates indicate the improved Li+ diffusion kinetics in the electrode after Ti doping.

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